Morphological varieties and kinetic behaviors of poly(3-hydroxybutyrate) (PHB) spherulites crystallized isothermally from thin melt film

Ding, Guangzhu; Liu, Jieping

doi:10.1007/s00396-012-2882-9

Cited by 31 publications

(36 citation statements)

References 37 publications

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“…Both PHB and PCL are highly crystalline polymers that form spherulites while crystallizing . From the melt, spherulites are typically obtained as crystalline arrangements with regular symmetry starting from a nucleation center.…”

Section: Resultsmentioning

confidence: 99%

“…PCL is reported also as biodegradable and biocompatible . PCL has been blended with PHAs using the casting method . The presence of two polymeric phases comes as a result from immiscibility of PHB and PCL in their blends .…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…PHB has been previously used as a crystallization model; by introducing changes on cooling temperature, cooling rates, and isothermal crystallization, differences in crystal length, number of spherulites, and lamellae thickness were observed . For pure PHB, the interband space and the average ratio of spherulites increased when the crystallization temperature was increased . Using sudden crystallization kinetics, the nuclei formation was impeded as well as the molecular array for crystal formation meanwhile, by using isothermal conditions, spherulites were larger and the crystals size was more homogeneous …”

Section: Introductionmentioning

confidence: 99%

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Thermal processing influence on mechanical, thermal, and biodegradation behavior in poly(β‐hydroxybutyrate)/poly(ε‐caprolactone) blends: A descriptive model

Vergara-Porras

Gracida

Pérez-Guevara

2016

J of Applied Polymer Sci

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Poly(β‐hydroxybutyrate) [PHB] is a biodegradable and biocompatible polymer produced by some bacteria genders. To improve mechanical properties, PHB has been blended with other polymers. Compression‐molded blends of PHB and poly(ε‐caprolactone) [PCL] (70/30 mass ratio) were cooled to room temperature following five different thermal treatments after molding at 180 °C. Blends processed with higher cooling rates were easier to biodegrade, nevertheless elongation at break and tensile strength decreased. Slower cooling kinetics and isothermal treatments increased perfection of crystals, as seen in differential scanning calorimetry and X‐ray diffraction and spherulites size. A descriptive model is proposed herein where thermal, biodegradation, tensile properties, and crystal features were related to cooling kinetics applied. It is proposed that properties of 70/30 (PHB/PCL) blends can be predetermined by an adequate control of thermal conditions during processing. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43569.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermal processing influence on mechanical, thermal, and biodegradation behavior in poly(β‐hydroxybutyrate)/poly(ε‐caprolactone) blends: A descriptive model

Vergara-Porras

Gracida

Pérez-Guevara

2016

J of Applied Polymer Sci

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“…It is well known that the banded texture of PLLA have been widely observed and studied in its blends with other components such as poly(ethylene oxide) (PEO), 18,19 poly(3-caprolactone) (PCL), 20 poly(3-hydroxybutyrate) (PHB) 21 and poly(ethylene glycol) (PEG), 22 and rhythmic growth and lamellar twisting theories have been proposed for the formation mechanism of the unique spherulites. [23][24][25] However, in the system of block copolymers, 17,26,27 the formation of banded texture of PLLA become quite complicated because of the strong molecular interaction, microphase separation and constrained geometry of each block, which make the investigations on banded spherulites of the block copolymers consisting of PLLA blocks are still under discussion and not yet claried up to now.…”

Section: Introductionmentioning

confidence: 99%

Crystallization and morphological transition of poly(l-lactide)–poly(ε-caprolactone) diblock copolymers with different block length ratios

et al. 2017

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The crystallization behavior, banded spherulite and morphological transition of poly(L-lactide) (PLLA) phases within the block copolymers were investigated. All experimental results showed that the structure and thermal properties of PLLA-PCL copolymers could be adjusted by varying the ratios of the chain length of the two blocks. Morphological results indicated that the banded spherulites of PLLA formed when PLLArich copolymers crystallized. PCL segments introduced unbalanced stresses around PLLA lamellar crystals, which resulted in a bending moment responsible for twisting of PLLA lamellar crystals. As the block length ratio of PCL to PLLA increased, an over accumulation of PCL segments influenced the twisting of PLLA lamellae. In addition, it was interesting to find that the banded spherulite morphology changed with increasing the crystallization temperature. The crystallization temperature has an effect on the relationship between the sense of lamellar twisting and the morphological transition of PLLA, which is reflected in the fact that the band spacing of banded spherulites showed strong temperature dependence when the crystallization temperature exceeds 115 C, while it exhibited weak temperature dependence below 115 C. In particular, above 125 C the band spacing disappeared and nonbanded spherulites formed.

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Evaluation of spherulite growth in PHB‐based systems – A DoE approach

Majerczak

Liggat

2023

J of Applied Polymer Sci

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Formulations based on poly(hydroxybutyrate) (PHB) and poly(hydroxybutyrate‐co‐valerate) were studied to statistically assess the importance of process parameters (temperature) and chemistry in filled and/or plasticized PHB‐based formulations on spherulite growth rate (SGR) and nucleation density (ND). It was found that in binary systems, addition of a plasticizer results in shift of the maximum SGR towards lower temperatures, with the value of the shift dependent on polymer‐plasticizer compatibility. The presence of the filler does not significantly influence SGR, instead resulting in ND changes dependent on filler chemistry, with Cloisite Ca++ showing the strongest nucleating action in all formulations among fillers studied. In ternary systems, statistical analysis shows that SGR strongly depends on the crystallization temperature (Tc), plasticizer type and concentration, and hydroxyvalerate content in the polymer chain while being independent of the presence and chemistry of the filler in the system. ND has, however, proven to be dependent on all investigated parameters, including both filler type and its concentration, with Tc being the most important factor. These results expand the understanding of factors controlling crystallization in polymer systems and provide an initial set of design tools that can be used to control mechanical properties in new generations of packaging materials.

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Morphological varieties and kinetic behaviors of poly(3-hydroxybutyrate) (PHB) spherulites crystallized isothermally from thin melt film

Cited by 31 publications

References 37 publications

Thermal processing influence on mechanical, thermal, and biodegradation behavior in poly(β‐hydroxybutyrate)/poly(ε‐caprolactone) blends: A descriptive model

Thermal processing influence on mechanical, thermal, and biodegradation behavior in poly(β‐hydroxybutyrate)/poly(ε‐caprolactone) blends: A descriptive model

Crystallization and morphological transition of poly(l-lactide)–poly(ε-caprolactone) diblock copolymers with different block length ratios

Evaluation of spherulite growth in PHB‐based systems – A DoE approach

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